> On Tue, May 26, 2009 at 5:31 PM, Danny Nicholas <danny@debsinc.com> wrote:
>
>> I run my analog telco over cat5, but that's in-house and definitely not 3km. That sounds really far for current loop stuff.
>>
> I was doing that too. I asked this same question a few years ago and
> the answer was 100-200 meters. This is just a quick rule of thumb, but
> it seems about right. 3km, I doubt that would work, but it depends, as
> someone said, totally depending on ohm's law :)
>

If it were to depend solely on Ohm's law, than 3km would be marginal but
probably within reach. Not exactly sure what other factors are there to
count.